Bioflavonoids helps prevent nosebleeds. eat at least one citrus fruit a day,being sure to include the white rubbery skin under the peel. It is called the pith,and is extremely rich in bioflavonoids.Also take vitamin C supplement with bioflavonoids. Eat green leafy vegetables,lots of them, to your diets. They are rich in vitamin K,needed for the production of prothrombin which is necessary for blood clotting.
Note If you are taking anti-clotting medication prescribed by your doctor,be aware that broccoli and turnip greens rich in vitamins K (the anti-clotting vitamin) may counteract the effects of the medicine.